Protective mounting for the lenses of moving-picture machines.



C. HUNTOON, W. C. ROLPES & W. L. WRIGHT. PROTECTIVE MOUNTING FOR THELENSES 0F MOVING Pl CTURE MACHINES. APFLIUATION FILED SEPT. 1. my.

1,053,5 12, Patented Feb. 18, 1913.

223a. aux.

Wiiwwow .UNITED STATES OFFICE.

CHARLES mnvroon, WILLIAM c. nouns, AND WALTER L. WRIGHT, or Los ANGELES,

\ CALIFORNIA.

PROTECTIVE MOUNTING FOR THE LENSES F MOVING-PICTURE MACHINES.

Specification of Letters Patent. Application filed September 1, 1911.Serial No. 647,216.

Patented. Feb. 18, 1911.3.

T 0 all whom it may concern:

Be it known that we, CHARLES H'ou'rooN, WVLLLIA .u. C. Ronrns, andVar/run L. lVmoirr, citizens of the United States, residing at LosAngeles, in the county of Los Angeles and State of California, haveinvented certain bility of the lenses to crack.

new and useful, Improvements in Protective Mountings for the Lenses ofMoving-Picture Machines, of which the following is a specification.

Our invention relates to machines for projecting moving. pictures, andparticularly to a mounting for the condensing lenses thereof.

In movingpicture machines a plurality of condensing lenses are used. Asusually mounted, these lenses are subjected to extreme variations oftemperature and are therefore extremely liable to crack. The mountingfor these lenses is of metal and the lenses contact directly with themetal. The metal mounting absorbs heat very readily and transmits thesame to the lens. In other words, the lenses of these machines are notordinarily insulated from the metal mounting thereof, which increasesthe lia- Furthermore, there is a direct contact between the lens and themetallic mounting, and as the glass and the metal have differentcoefficients of expansion, there is a great liability of the bynon-heat-conducting material from contact with the metal mounting.

Another object is to provide a very simple and effective mour ting forlenses permitting the ready removal and replacement of the lens and yetholding the lenses securely in position when the mounting is inserted inthe lamp housing.

An embodiment of our invention is illustrated in the accompanyingdrawings wherein:

Figure 1 is a face view of the lens mounting. Fig. 2 is a diametricalsection through the body and the oppositely disposed lens caps. Fig. 3is a perspective view of the mounting, the parts being separated. Fig. 4is a fragmentary enlarged section of one of the caps and a portion of alens.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the accompanying drawingsby the same reference characters.

Referring to these drawings, 2 designates the body of the mountingcomprising an annular metallic rim relatively wide and provided at itsmargins with the inwardly turned annular flanges 3 and 4. This rim ispreferably made of relatively thin material and hence the flanges 3 and4 are turned inward so as to secure a relatively wide abutting face at.the side edges of the body 2.

The lenses 10 are contained within the oppositely disposed cells or caps5 which have telescopic engagement with the body 2. Both caps are of thesame construction and hence a description of one will apply equally wellto the other. Each cap comprises an annular relatively wide rim of metalabout half the width of the body portion 2 and somewhat larger indiameter than said body portion so as to slip snugly over the bodyportion. Each capis provided at one end with the inwardly t ilrnedannular flange i Disposed within each cap andhcld against the insideface of the flange 6 is a packing ring 7. v This packing ring ispreferably attached 'permancntly in place against the flange (i by meansof any suitable adhesive compoupd, but preferably by means of a compoupdcontaining asbestos or other nonconductlng material. The packing rlng 7is of such width that it projects beyond the flange (3,, as illustratedin Fig. 3. A layer of asbestos is also permanently attached to the innerface of each cell or cap 5 by means of any suitablendhesive and extendsinward beyond the inner face of the packing ring 7. This inwardlyextending layer of as bestos or other non-heat-conductingmaterial isdesignated 8.

The lens 10 may be of any suitable form but is shown as plano-convcx,such being the ordinary form of condensing lens for use with movingpicture machines. The margin of the lens rests against the packing ring7, while the edge of the lens is protected from contact with the metalof thecap or cell 5 by means of the layer of asbestos 8.

Disposed uponthe inner face of the lens 10 and contacting with themargin thereof .is the packing ring 9 which is also or" asbestos orother non-heat-conducting material and is preferably relatively fiat.The packing ring fits snugly Within the cell or cap 5 and contacts withthe Wall of the cap. It has practically the same thickness as thepacking ring 7. Each lens 10 is loose within the corresponding cell, asis each of the packingrings 9. These cells 5. however, may be forcedover or telescoped upon the body portion 2, and when they are forcedhome the flanges 3 and 4: will contact with the packing rings 9 and willhold the lenses 10 in proper position and properly spaced from eachother, as shown in Fig. 2.

It will of course be understood that the cells or caps 5 fit the bodyportion 2 so snugly as to have frictional engagement with the bodyportion so that when the caps are forced tightly in place upon the bodyportion 2, the lenses will be held firmly in position and the caps 5cannot become detached from the body portion 2 except with intention.When the caps have been placed upon the body portion 2 with the lensesin place as before described, the mounting is in condition for insertionin the lamp house.

It has not been cons1dered necessary to show any portion of the lamp asthe construction thereof is well known.

While we have found that asbestos is extremely eitective as, a means ofinsulating the lenses from contact with the metal mounting, we do notwish to be limited to this as it is obvious that other non-conductingmaterial might be used. It will be seen that no metal touches thelenses. The packing ring 7 separates the front face of each lens fromthe flange 6; the layer 80f non-conducting material separates the edgeof each lens from the metal of the cell, while the packing ring 9separates the inner face of the lens from contact with the flanges 3 orl. Thus While the lenses are held firmly in place, they are entirelyinsulated from contact With themctal mounting, and hence the heattransmitted to this metal mounting cannot be in turn transmitted to thelenses. Furthermore, it will be obvious that the glass of the lenses mayfreely-expand and masses also permits of an even contraction of the edgeof the condenser.

What we claim is:

l. A mounting for the conclcnsinlenses of moving picture machines, incluingcan annular cell having an inwardly turned flange at one end, anon-heat-conducting packing ring disposed within the cell and againstsaid flange, a lens within the cell and supported against the packingring, non-hent-conducting material. disposed be tween the edge of thelens and the inner face of the cell, a packing ring ofnonheat-conducting material disposed against the inner face of themargin of the lens, and an annular member slightly less in diameter thanthe cell inserted therein and bearing against said last named packingring to hold the lens in place.

2. A mounting for the condensing lenses of moving picture machines,including an annular. relatively Wide body portion ing an inwardlyextending flange on each margin, opposed caps forming cells forcondensing lenses and having telescopic engagement with the bodyportion, each of said caps having an inwardly turned flange upon onemargin, condensing lenses locatedm said caps. non-heat-conductingmaterial disposed between each lens'and the adjacent flange of the capand surrounding the edge of the lens, and removable packing rings ofnonheat-conducting material disposed .upon

the inner faces of the margins of the lenses with which the flanged endsof the-body portion engage to hold the lenses in place.

In testimony whereof We afiix our signatures in presence of twoWitnesses.

CHARLES HUNTUON. [1 a] l/VIRLIAM C. ROLFES. [11. a} I WALIIER L.lVRlGl-XT. EL. a} .lVitncsses:

STEPHEN Mon'rnnnonn, F. M. SHEPARD.

av- I

